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Python grpc超時(shí)機(jī)制代碼示例

更新時(shí)間：2020年09月14日 11:03:53 作者：冷冰若水

這篇文章主要介紹了Python grpc超時(shí)機(jī)制代碼示例,文中通過示例代碼介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值,需要的朋友可以參考下

工作中遇到一個(gè)問題，上游服務(wù)通過grpc調(diào)用下游服務(wù)，但是由于下游服務(wù)負(fù)載太高導(dǎo)致上游服務(wù)的調(diào)用會(huì)隨機(jī)出現(xiàn)超時(shí)的情況，但是有一點(diǎn)不太明確：超時(shí)之后，下游服務(wù)還會(huì)繼續(xù)進(jìn)行計(jì)算么？

于是自己寫了一個(gè)damon試了一下：

client：

# Copyright 2015 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""The Python implementation of the GRPC helloworld.Greeter client."""

from __future__ import print_function
import logging

import grpc

import helloworld_pb2
import helloworld_pb2_grpc


def run():
  # NOTE(gRPC Python Team): .close() is possible on a channel and should be
  # used in circumstances in which the with statement does not fit the needs
  # of the code.
  with grpc.insecure_channel('localhost:50051') as channel:
    stub = helloworld_pb2_grpc.GreeterStub(channel)
    response = stub.SayHello(helloworld_pb2.HelloRequest(name='you'), timeout=30)
  print("Greeter client received: " + response.message)


if __name__ == '__main__':
  logging.basicConfig()
  run()

server：

# Copyright 2015 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""The Python implementation of the GRPC helloworld.Greeter server."""

from concurrent import futures
import time
import logging

import grpc

import helloworld_pb2
import helloworld_pb2_grpc

_ONE_DAY_IN_SECONDS = 60 * 60 * 24


class Greeter(helloworld_pb2_grpc.GreeterServicer):

  def SayHello(self, request, context):
  count = 0
  while count < 10:
    print('time:%s' % (time.time()))
    time.sleep(5)
    return helloworld_pb2.HelloReply(message='Hello, %s!' % request.name)


def serve():
  server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))
  helloworld_pb2_grpc.add_GreeterServicer_to_server(Greeter(), server)
  server.add_insecure_port('[::]:50051')
  server.start()
  try:
    while True:
      time.sleep(_ONE_DAY_IN_SECONDS)
  except KeyboardInterrupt:
    server.stop(0)


if __name__ == '__main__':
  logging.basicConfig()
  serve()

這兩個(gè)例子就是在grpc官方提供的python例子上做了一下小的改動(dòng)，得到的結(jié)果是：當(dāng)client超時(shí)報(bào)錯(cuò)退出之后，server還是會(huì)繼續(xù)進(jìn)行計(jì)算，直到結(jié)束，那如果是這樣的話，超時(shí)的機(jī)制對(duì)于server來說是沒有作用的，即使client已經(jīng)不再等待這個(gè)結(jié)果了，但是server還是會(huì)繼續(xù)計(jì)算，浪費(fèi)server的資源。

以上就是本文的全部內(nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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